Does anyone know how the throttle pedal position works? I'm thinking I could wire a switch and resistor to fake holding my foot at 1500 RPM. If the pedal position is a resistance, I don't see why that wouldn't work. Voltage is irrelevant if I use what's already there. Anybody thought about this yet? I am an electrician and quite comfortable hacking wires on my new truck to make this work seeing as its no longer an option without a tuner. If I can figure this out and test it, I would be happy to build a pile of them for some guys lucky enough to have a G56.

 

nobody? is there a procedure to test the accelerator pedal? I can go find values myself, just need to know which wires to check. is the pedal called the tps or apps? I could do some research but i'm not even sure what they call it.

 

Not to send you down the wrong path here but I recall 3rd gen manual owners that wanted high idle had to have a pin or wire right off the ECM grounded and then just take it to the dealer to get it enabled for free (most of the time) again this was on 3rd gens not sure if a similar solution could work on a 4th gen.

Maybe worth looking into tho

 

I had to do this this with my 3rd gen, not sure if it is the same for the 4th.

Here is a link:


https://www.dieseltruckresource.com/...k-t225943.html

 

I do know it is possible to install a high idle on a 2011 G56 because the dealer did one for my son when the truck was new, it is a two speed one with two switches. I can also tell you that in the frozen North your truck will not work even with this, it will coke up if you intend to idle it without deleting it. You will dilute the oil, throw codes and hardly ever complete a regen, your fuel mileage will be non existent.

 

Busboy, could you possibly find out a brand name or part number for the kit if its mopar? I know it won't help out much engine wise without a delete but my truck is used for work and I want the idle to run my screw compressor on a PTO. Any info you could find would be much appreciated.

 

Sorry try this link with pics: Might work

https://www.dieseltruckresource.com/...6-t215027.html

 

From what I am told from the dealership, DC did not set up the 2012 Manual trucks with PTO feature.
If you want a manual high idle then you need to use a rock, install a throttle cable, buy a H&S programmer or rig up some form a electric controller.

I have been hounding them to get something done to my truck.

 

Dodge did away with the manual trans fast idle in 2010+.

Busboy I am really curious what your son has, just as many 2010+ manual trans owners are.

As of right now the H&S is the best, and only, way I know of to get fast idle on a 4th gen manual.

The TPS idea is good, but it takes a different voltage for 1500 rpms based on load, temp, a/c, ECT, etc...

 

I understand that the load and temps will affect the throttle but would it not be identical to holding my foot on the pedal? If the resistance is the same, it should work the exact same, no?

 

I don't believe they use resistance, but voltage.

Use your foot and watch TPS in relation to rpm. Some mornings a 15% TPS may get you 1500, others 1800 or 1200. (arbitrary numbers for reference only)

 

The way a standard apps works is a voltage is sent from the ECM to the unit. When you apply pressure to the pedal, it wipes a variable resistor and causes the output voltage to change based on the changing resistance of the circuit. So you're right that it is a voltage signal to the ECM, but is indeed caused by a resistor.

 

When my son bought the 2011 new he had it put in the sales agreement that they would install a high idle and they did. I hardly ever see my son or the truck as he is always away working and is currently out of cell range. The truck is a work truck and the high idle did not work to warm up or even keep the engine warm. I'm sure some must remember the pics of his intake when we tore it apart to see what was causing all the problems. He is now fully deleted and using a Mini Maxx with no problems but the switches still do work.

I can tell you there are two switches mounted on the side of the steering column, one sw sets the idle high the next sets it even higher. I don't expect my son back until after Christmas at the earliest but I can swing by the dealer we got our trucks from and talk with the service manager, he is an auto enthusiast and did seem quite knowledgeable about their diesel trucks. I'll post what I find out.

My guess at the system is the first sw feeds a set voltage around 2 volts with the second voltage around 3 volts, if max voltage is 5.7v for 3000rpm that would give 1200rmp and 1800rpm. Also need to kill the pedal at idle signal, that could be done by using a dual pole sw for the first sw. It would also be possible to use a LVDT or RVDT and just dial in the voltage you want each time.

 

That is defiantly not a factory fast idle option.

On my 5.9 the difference in warm up and staying warm from 750 rpm to 1100 rpms is significant.

 

Yeh it doesn't look factory just the dealer installed it. I had a call early this morning and my son was in cell range heading this way for something so I may get to see the truck in the next few days after all.